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Classifying Schematic and Data Heterogeneity in Multidatabase Systems
December 1991 (vol. 24 no. 12)
pp. 12-18

A complete framework for enumerating and classifying the types of multidatabase system (MDBS) structural and representational discrepancies is developed. The framework is structured according to a relational database schema and is both practical and complete. It was used to build the UniSQL/M commercial multidatabase system. This MDBS was built over Structured-Query-Language-based relational database systems and a unified relational and object-oriented database system named UniSQL/X. However, the results are substantially applicable to heterogeneous database systems that use a nonrelational data model (for example, an object-oriented data model) as the common data model and allow the formulation of queries directly against the component database schemas.

Won Kim, Jungyun Seo, "Classifying Schematic and Data Heterogeneity in Multidatabase Systems," Computer, vol. 24, no. 12, pp. 12-18, Dec. 1991, doi:10.1109/2.116884
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